Update on the Temperature Corrections of Global Air-Sea CO2 Flux Estimates

Dong, Yuanxu; Bakker, Dorothee C. E.; Bell, Thomas G.; Huang, Boyin; Landschützer, Peter; Liss, Peter S.; Yang, Mingxi

doi:10.1029/2022GB007360

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Update on the Temperature Corrections of Global Air-Sea CO2 Flux Estimates

2022
By Dong, Yuanxu ; Bakker, Dorothee C. E. ; Bell, Thomas G. ; ...
Source: Global Biogeochemical Cycles, 36(9)

[PDF-993.15 KB]

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Details:

Journal Title:

Global Biogeochemical Cycles
Personal Author:

Dong, Yuanxu ; Bakker, Dorothee C. E. ; Bell, Thomas G. ; Huang, Boyin ; Landschützer, Peter ; ... More +

Dong, Yuanxu ; Bakker, Dorothee C. E. ; Bell, Thomas G. ; Huang, Boyin ; Landschützer, Peter ; Liss, Peter S. ; Yang, Mingxi Less -
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information)

NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information) Less -
Description:

The oceans are a major carbon sink. Sea surface temperature (SST) is a crucial variable in the calculation of the air-sea carbon dioxide (CO2) flux from surface observations. Any bias in the SST or any upper ocean vertical temperature gradient (e.g., the cool skin effect) potentially generates a bias in the CO2 flux estimates. A recent study suggested a substantial increase (∼50% or ∼0.9 Pg C yr−1) in the global ocean CO2 uptake due to this temperature effect. Here, we use a gold standard buoy SST data set as the reference to assess the accuracy of insitu SST used for flux calculation. A physical model is then used to estimate the cool skin effect, which varies with latitude. The bias-corrected SST (assessed by buoy SST) coupled with the physics-based cool skin correction increases the average ocean CO2 uptake by ∼35% (0.6 Pg C yr−1) from 1982 to 2020, which is substantially smaller than the previous correction. After these temperature considerations, we estimate an average net ocean CO2 uptake of 2.2 ± 0.4 Pg C yr−1 from 1994 to 2007 based on an ensemble of surface observation-based flux estimates, in line with the independent interior ocean carbon storage estimate corrected for the river induced natural outgassing flux (2.1 ± 0.4 Pg C yr−1).
Keywords:

[+]

Earth Temperature Ocean-atmosphere Interaction Ocean Temperature Air-sea CO2 Flux Atmospheric Science Environmental Chemistry General Environmental Science Global And Planetary Change Temperature Effects Updated Correction
Source:

Global Biogeochemical Cycles, 36(9)
DOI:

https://doi.org/10.1029/2022GB007360
ISSN:

0886-6236;1944-9224;
Format:

PDF
Publisher:

American Geophysical Union (AGU)
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:fdb0fe35dd68ffa7df2d925cc584a415bf684ee75b5960ba513035e6b8bee54e
Download URL:

https://repository.library.noaa.gov/view/noaa/48921/noaa_48921_DS1.pdf
File Type:

	Supplemental media	pdf
	Supplemental media	xlsx

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